:root {
    --aside-width: 180px;
}

.App-aside {
    width: var(--aside-width);
    float: left;
    overflow-y: auto;
}

.App-main {
    background: #eee;
    margin-left: var(--aside-width);
}

.App-main, .App-aside {
    height: calc(100vh - 100px)
}

.App-footer {
    background: #ccc;
    height: 40px;
}

.App-header {
    background: #ddd;
    overflow: hidden;
    height: 60px;
    padding-left: 20px;
    line-height: 60px;
}

.App-header h1 {
    font-size: 20px;
    margin: 0;
    float: left;
}

.App-user {
    float: right;
    padding-right: 20px;
}

.logIn-form {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 400px;
    height: 150px;
    margin: auto;
    border: 1px solid red;
    border-radius: 5px;
    padding: 40px;
}